3 years ago

PLZ HELP WILL GIVE BRAINLIEST!!!! AND 20 POINTS

Mathematics

1 answer:

defon3 years ago

6 0

The answer should be c

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To travel 105 miles, it takes Sue, riding a moped, 3 hours less time than it takes Doreen to travel 64 miles riding a bicycle. S

Volgvan

Let t=time Doreen travels; let r=rate of Doreen

RATE * TIME = DIST.
Sue | r+13 t-3 105
Doreen | r t 64

Now solve the system:
(r+13)(t-3)=105
r*t=64

 $r= \frac{64}{t} 
\\
\\(\frac{64}{t} +13)(t-3)=105 
\\
\\64- \frac{192} {t}+13t-39-105=0
\\
\\13t- \frac{192} {t}-80=0
\\
\\ 13t^2-80t-192=0
\\
\\t_{1,2}= \frac{80\pm \sqrt{(-80)^2-4\times13(-192)} }{2\times13}= \frac{80\pm128}{26} 
\\
\\t=\frac{80+128}{26} =8
\\
\\r=\frac{64}{t} =\frac{64}{8} =8$ 

Doreen: rate = 8 mph, time = 8 hours
Sue: rate = 21 mph, time = 5 hours

8 0

3 years ago

The pastor divided the 3,000 circulars among 15 teenagers. How many circulars did each young person receive?

pav-90 [236]

Each young person received 200 circulars.

3,000/15= 200

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3 years ago

Help if u have a heart

lina2011 [118]

Answer:

Step-by-step explanation:

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A square has an area of 100 square meters. What is the perimeter of the square?

ser-zykov [4K]

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and The area is 100, so square root that and you get your length which is 10 meters.
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3 years ago

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